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Nebula
A nebula is a giant cloud of gas (mostly hydrogen and helium) and cosmic dust situated between stars in the interstellar medium. Nebulae serve as sites of stellar birth and death—including emission nebulae that glow from ionized gas, reflection nebulae that scatter starlight, and dark nebulae that obscure background stars.
Source: science.nasa.gov
APODs including "Nebula"
The Bubble and M52
08/10/2013
The Fairy of Eagle Nebula
29/09/2013
Andromeda on the Rocks
27/09/2013
M81 versus M82
25/09/2013
IC 4628: The Prawn Nebula
23/09/2013
M2-9: Wings of a Butterfly Nebula
15/09/2013
Stars and Dust Across Corona Australis
12/09/2013
Nearby Cepheid Variable RS Pup
09/09/2013
M1: The Incredible Expanding Crab
05/09/2013
IRAS 20324: Evaporating Protostar
04/09/2013
North America and the Pelican
03/09/2013
NGC 5195: The Dot Under the Question Mark
31/08/2013
A Sagittarius Triplet
30/08/2013
Bright Planetary Nebula NGC 7027 from Hubble
26/08/2013
A Spectrum of Nova Delphini
23/08/2013
IC 5067 in the Pelican Nebula
22/08/2013
M8: The Lagoon Nebula
17/08/2013
In the Vicinity of the Cone Nebula
06/08/2013
NGC 2392 from Hubble and Chandra
30/07/2013
Atacama's Cloudy Night
27/07/2013
The Elephant's Trunk in IC 1396
26/07/2013
The Beautiful Trifid
25/07/2013
Comet Lemmon and the Deep Sky
20/07/2013
The Pillars of Eagle Castle
14/07/2013
Messier's Eleven
12/07/2013
Dusty Nebulae in Taurus
11/07/2013
Supergiant Star Gamma Cygni
09/07/2013
NGC 2170: Still Life with Reflecting Dust
07/07/2013
Sharpless 115
14/06/2013
Star Forming Region NGC 3582
11/06/2013